Pipeline structure of medical molecular sieve oxygenerator

Abstract

The utility model provides a pipeline structure of a medical molecular sieve oxygenerator. The pipeline structure comprises a molecular sieve tower A, a molecular sieve tower B, a lower pressure equalizing valve, an upper pressure equalizing valve and a throttling ring A, oxygen outlets of the molecular sieve tower A and the molecular sieve tower B are respectively connected with an oxygen outlet valve A and an oxygen outlet valve B and then are gathered to an oxygen buffer pipeline; one end of the lower pressure equalizing valve is connected to a pipeline between the air inlet valve A and the molecular sieve tower A, and the other end of the lower pressure equalizing valve is connected to a pipeline between the air inlet valve B and the molecular sieve tower B; one end of the upper pressure equalizing valve is connected to the pipeline between the oxygen outlet valve A and the molecular sieve tower A, and the other end of the upper pressure equalizing valve is connected to the pipeline between the oxygen outlet valve B and the molecular sieve tower B. The throttling ring A and the upper pressure equalizing valve are arranged in the pipeline in parallel. The structure has the advantages of high purity stability of prepared oxygen, shortened pressure equalizing time, improved circulation efficiency, remarkable energy conservation, prolonged equipment service life, high oxygen recovery rate and the like.

Description

Technical Field

[0001] The utility model mainly relates to the technical field related to oxygen concentrators, and in particular to a pipeline structure of a medical molecular sieve oxygen concentrator. Background Art

[0002] The basic working principle of an oxygen concentrator is as follows: air is compressed by a compressor and then enters a molecular sieve. The two molecular sieves on the left and right rotate through the adsorption phase, desorption phase, and pressure equalization phase. The separated oxygen passes through a one-way valve and enters the gas storage tank. After passing through related components, it reaches the outlet. Currently, PSA oxygen concentrators generally use a dual-pressure cycle to produce oxygen. During the cycle, one adsorption tank takes in air, absorbs nitrogen, and produces oxygen, which enters the oxygen storage tank. Simultaneously, the other adsorption tank desorbs nitrogen. The two adsorption towers operate alternately. When the equipment is first turned on, the oxygen concentration produced does not meet medical standards. As the equipment operates, the oxygen concentration gradually increases to meet medical standards.

[0003] Existing technologies, such as those described in application publication number CN119386624A, describe a high-efficiency, energy-saving PSA oxygen concentrator. These utilize a single-circuit pressure equalization system (top line only) and a continuous pressure equalization system with a throttling ring. These systems present the following challenges: Large fluctuations in oxygen purity: insufficient bottom pressure recovery results in residual nitrogen, with oxygen purity fluctuations reaching ±1.5%; high energy consumption: the compressor must start from zero pressure, increasing energy consumption; and short equipment life: the single-circuit pressure equalization system is ineffective, and high-speed airflow during intake impacts the molecular sieve bed, accelerating wear.

[0004] Traditional medical molecular sieve oxygen concentrators do not have an emptying function based on oxygen concentration. During actual operation, the low-concentration unqualified oxygen produced by the oxygen concentrator will enter the oxygen storage tank, causing the qualified oxygen in the oxygen storage tank to be contaminated. At the same time, there is no oxygen outlet throttling ring, oxygen buffer tank, etc., and the oxygen-rich gas cannot be recovered. Utility Model Content

[0005] In order to solve the shortcomings of current technology, the utility model combines existing technology and, based on practical application, provides a medical molecular sieve oxygen concentrator pipeline structure, which has the advantages of high purity and stability of the produced oxygen, shortened pressure equalization time, improved circulation efficiency, significant energy saving, extended equipment life, and high oxygen recovery rate.

[0006] The technical solution of the utility model is as follows:

[0007] A medical molecular sieve oxygen concentrator pipeline structure includes molecular sieve tower A and molecular sieve tower B. Compressed air is connected to the air inlets of molecular sieve tower A and molecular sieve tower B respectively through air inlet valve A and air inlet valve B. The pipeline structure also includes a lower equalizing valve, an upper equalizing valve and a throttle ring A.

[0008] The oxygen outlets of the molecular sieve tower A and the molecular sieve tower B are respectively connected to the oxygen outlet valve A and the oxygen outlet valve B and then converged into the oxygen buffer pipeline;

[0009] One end of the lower pressure equalizing valve is connected to the pipeline between the air inlet valve A and the molecular sieve tower A, and the other end is connected to the pipeline between the air inlet valve B and the molecular sieve tower B;

[0010] One end of the upper pressure equalizing valve is connected to the pipeline between the oxygen outlet valve A and the molecular sieve tower A, and the other end is connected to the pipeline between the oxygen outlet valve B and the molecular sieve tower B;

[0011] The throttle ring A and the upper pressure equalizing valve are arranged in parallel in the pipeline.

[0012] Furthermore, the throttle ring A is a reduced-diameter throttle valve with an internal aperture of 2 mm.

[0013] Furthermore, an oxygen buffer valve is provided on the oxygen buffer pipeline, and a PU hose is provided in parallel with the oxygen buffer valve, and a throttling ring B is provided in the hose.

[0014] Furthermore, the throttle ring B is a reduced-diameter throttle valve with an internal aperture of 2.5 mm.

[0015] Furthermore, the end of the oxygen buffer pipeline is connected to a buffer tank, and the buffer tank is connected to the total oxygen outlet pipeline;

[0016] The total oxygen outlet pipeline has two branch pipelines, one is an unqualified oxygen exhaust pipeline, and the other is a qualified oxygen outlet pipeline. The unqualified oxygen exhaust pipeline is sequentially provided with an exhaust valve, a throttling ring C and a nitrogen exhaust silencer. The qualified oxygen outlet pipeline is installed with a total oxygen outlet valve and then connected to the gas storage tank.

[0017] Furthermore, a pressure detector, an oxygen concentration detector, and an oxygen flow meter are installed at the front end of the branch of the total oxygen outlet pipeline.

[0018] Furthermore, the throttle ring C is a reduced-diameter throttle valve with an internal aperture of 3 mm.

[0019] Beneficial effects of the utility model:

[0020] 1. The top pressure equalizing pipeline gives priority to transferring high-purity oxygen (the oxygen concentration at the top of the tower is the highest at the end of adsorption), directly providing initial high-purity gas to the low-pressure tower, reducing the mixing of impurity gases (such as nitrogen); the bottom pressure equalizing pipeline balances the pressure at the bottom of the tower, avoiding the disorder of air flow distribution caused by uneven pressure at the bottom, and preventing nitrogen from penetrating the bed layer at the initial stage of adsorption; by balancing the air pressure in the two towers through the joint action of the top, bottom and continuous pressure equalizing pipelines, the oxygen-rich air that was originally to be emptied with the nitrogen exhaust process is transferred to the other tower, and after re-adsorption, the oxygen The top and bottom are opened at the same time, and the gas flows into the low-pressure tower from the top and bottom of the high-pressure tower in both directions, achieving rapid pressure balance in the tower. The dual-gas path design can recover the residual pressure of the high-pressure tower, pre-pressurize the low-pressure tower, reduce air consumption, and reduce the energy consumption of the compressor in the subsequent air intake stage. When the low-pressure tower is intaken for oxygen production, since the low-pressure tower has been pressure-equalized through the dual gas paths, medium-pressure gas is pre-stored in the tower, which reduces the pressure mutation when the compressed air is injected in the oxygen production stage, reduces the impact of the molecular sieve particles on the airflow, and reduces the wear rate of the molecular sieve.

[0021] 2. The design concept of this pipeline structure is novel, which solves the problems of single pipeline structure, low oxygen recovery rate and unstable concentration of existing technical equipment. The throttling ring B controls the flow of oxygen generated by the adsorption tower into the buffer tank to avoid poor adsorption effect due to excessive oxygen production flow in the adsorption tower, and is used to maintain the stability of the output oxygen concentration. The start and stop of the oxygen buffer valve is controlled by the pressure in the adsorption tower, which avoids the pulverization of the molecular sieve due to excessive pressure in the tower during the oxygen production process, thereby increasing the service life of the molecular sieve. The total oxygen outlet pipeline and the unqualified oxygen exhaust pipeline work together according to the oxygen concentration in the buffer tank to ensure that the unqualified oxygen is emptied and does not enter the oxygen storage tank and the oxygen terminal, ensuring that the unqualified oxygen is completely isolated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 Schematic diagram of the overall structure of the piping system.

[0023] The numbers shown in the accompanying drawings are: 1. Air inlet valve A; 2. Air inlet valve B; 3. Lower equalizing valve; 4. Molecular sieve tower A; 5. Molecular sieve tower B; 6. Upper equalizing valve; 7. Throttle ring A; 8. Oxygen outlet valve A; 9. Oxygen outlet valve B; 10. Oxygen buffer valve; 11. Throttle ring B; 12. Buffer tank; 13. Pressure detector; 14. Oxygen concentration detector; 15. Oxygen flowmeter; 16. Total oxygen outlet valve; 17. Exhaust valve; 18. Throttle ring C; 19. Nitrogen exhaust silencer; 20. Gas storage tank. DETAILED DESCRIPTION

[0024] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that such equivalent forms also fall within the scope defined in this application.

[0025] This embodiment provides a pipeline structure for a medical molecular sieve oxygen concentrator, which includes a dual-gas-path pressure-equalizing portion and a low-concentration oxygen exhaust portion.

[0026] The pressure-equalizing section uses a dual-circuit pressure-equalizing pipeline, including molecular sieve tower A4, molecular sieve tower B5, air inlet valve A1, air inlet valve B2, lower pressure-equalizing valve 3, throttle ring A7, upper pressure-equalizing valve 6, oxygen outlet valve A8, and oxygen outlet valve B9. The connection relationship is as follows: compressed air enters air inlet valve A1 and air inlet valve B2 in two ways, and air inlet valve A1 and air inlet valve B2 are respectively connected to the air inlets of molecular sieve tower A4 and molecular sieve tower B5. One end of the lower pressure-equalizing valve 3 is connected to the pipeline between air inlet valve A1 and molecular sieve tower A4, and the other end is connected to the pipeline between air inlet valve B2 and molecular sieve tower B5. The oxygen outlets of molecular sieve towers A4 and B5 are respectively connected to oxygen outlet valves A8 and oxygen outlet valves B9, and then converge into the oxygen buffer pipeline. One end of the upper pressure equalizing valve 6 is connected to the pipeline between the oxygen outlet valve A8 and the molecular sieve tower A4, and the other end is connected to the pipeline between the oxygen outlet valve B9 and the molecular sieve tower B5; the throttle ring A7 and the upper pressure equalizing valve 6 are arranged in parallel in the pipeline.

[0027] In the above structure, the upper equalizing valve 6 in the top equalizing line is used to transfer high-purity oxygen during pressure equalization. The lower equalizing valve 3 in the bottom equalizing line balances the pressure at the tower bottom, eliminating dead zones. A 2mm ID throttle ring A7 is installed on the equalizing line to limit the gas flow rate. The upper and lower equalizing valves 6 and 3 independently control the opening and closing of the two gas circuits. Molecular sieve towers A4 and B5 operate alternately, and during the equalization phase, the two gas circuits are opened simultaneously to achieve pressure balance throughout the tower.

[0028] In the above structure, the working process is as follows (taking the switching of molecular sieve tower A4→molecular sieve tower B5 as an example).

[0029] 1. Molecular sieve tower A4 oxygen production stage:

[0030] 1.1 The air inlet valve A1 and oxygen outlet valve A8 of the molecular sieve tower A4 are opened, and compressed air enters the molecular sieve to adsorb nitrogen and output oxygen.

[0031] 1.2 The nitrogen exhaust valve of molecular sieve tower B5 is opened, and the backflush airflow from molecular sieve tower A4 is received through throttle ring A7 to assist in nitrogen exhaust.

[0032] 2. Pressure equalization stage:

[0033] 2.1 The air inlet valve A1 and oxygen outlet valve A8 of the molecular sieve tower A4 are closed, and the upper equalizing valve 6 and the lower equalizing valve 3 are opened simultaneously.

[0034] 2.2 Top pressure equalization: The oxygen-rich gas at the top of the molecular sieve tower A4 flows into the top of the molecular sieve tower B5, directly improving the initial oxygen purity.

[0035] 2.3 Bottom pressure equalization: The gas at the bottom of molecular sieve tower A4 flows into the bottom of molecular sieve tower B5 to eliminate the residual nitrogen at the bottom of molecular sieve tower B5.

[0036] 2.4 The throttle ring A7 limits the flow rate and ensures a smooth pressure transition.

[0037] 3. Molecular sieve tower B5 oxygen production stage (30 seconds):

[0038] 3.1 Molecular sieve tower B5 opens the air inlet valve B2 and oxygen outlet valve B9 to start adsorption oxygen production.

[0039] 3.2 The nitrogen exhaust valve of molecular sieve tower A4 is opened to receive the backflush airflow from molecular sieve tower B5 to complete regeneration.

[0040] The above structure utilizes dual, synchronous pressure-equalizing paths at the top and bottom, overcoming the limitations of traditional single-path designs. This optimizes both oxygen recovery and pressure protection: oxygen-rich gas is recovered during the pressure-equalizing phase to reduce oxygen waste, and medium-pressure gas is pre-stored within the tower after pressure equalization to avoid sudden pressure fluctuations during the oxygen production phase. This pre-stored medium-pressure gas within the tower after pressure equalization reduces pressure fluctuations during compressed air injection and minimizes the impact of airflow on molecular sieve particles.

[0041] The low-concentration oxygen exhaust part is located behind the pressure equalizing part. Specifically: an oxygen buffer valve 10 is installed in the oxygen buffer pipeline, and a PU hose is connected in parallel to the oxygen buffer valve 10, a throttling ring B11 is provided in the hose, and the end of the oxygen buffer pipeline is connected to the buffer tank 12, and the buffer tank 12 is connected to the total oxygen outlet pipeline. An oxygen concentration detector 14, a pressure detector 13, and an oxygen flow meter 15 are installed in the total oxygen outlet pipeline. The subsequent gas circuit is divided into two, one for the unqualified oxygen exhaust pipeline and the other for the qualified oxygen outlet pipeline. An exhaust valve 17 is installed in the unqualified oxygen exhaust pipeline, and a throttling ring C18 is installed in the pipeline after the exhaust valve 17, and then a nitrogen exhaust silencer 19 is connected to reduce noise when exhausting unqualified oxygen. A total oxygen outlet valve 16 is installed in the qualified oxygen outlet pipeline, and a pressure regulating valve can be installed after the total oxygen outlet valve 16. Finally, the pipeline is connected to the gas storage tank 20 for the oxygen equipment terminal.

[0042] In the above structure, the oxygen concentration of the oxygen concentrator is low when it is just turned on, and it cannot directly enter the gas storage tank and the oxygen terminal. Unqualified oxygen needs to be emptied. When the oxygen concentration is detected to be qualified, it will no longer be emptied, and qualified oxygen will enter the gas storage tank. Therefore, in the low-concentration oxygen emptying structure, after the oxygen concentrator is turned on, the oxygen outlet valve A8 and the oxygen outlet valve B9 are discharged, and the oxygen enters the buffer tank 12 through the throttle ring B11. The unqualified oxygen in the buffer tank 12 is emptied through the emptying valve 17, the throttle ring C18, and the nitrogen exhaust silencer 19. As the equipment runs, the oxygen concentration produced gradually increases. When the oxygen concentration detector 14 detects that the oxygen concentration in the buffer tank 12 is qualified, the emptying valve 17 is closed, the main oxygen outlet valve 16 is opened, and the qualified oxygen is passed into the gas storage tank 20 or connected to the oxygen terminal.

[0043] Among them, the throttle ring B11 is a reducing throttle valve with an internal aperture of 2.5mm. Its function is to control the flow of oxygen generated by the adsorption tower into the buffer tank 12 to avoid the adsorption tower producing oxygen too quickly, resulting in poor adsorption effect, thereby affecting the oxygen production concentration.

[0044] The oxygen buffer valve 10 protects the molecular sieve inside the adsorption tower. Its opening and closing are controlled by the pressure inside the tower. When the pressure inside the tower reaches the upper limit set by the argon, the oxygen buffer valve 10 opens, rapidly releasing the high-pressure oxygen inside the adsorption tower into the buffer tank 12. As the pressure inside the adsorption tower decreases to the lower limit set by the pressure, the valve closes. This prevents the molecular sieve from pulverizing due to excessive pressure inside the tower during the oxygen production process, thereby extending the service life of the molecular sieve.

[0045] The buffer tank 12 is used to temporarily store and buffer the oxygen produced by the adsorption tower. By detecting the oxygen concentration inside the buffer tank 12, the gas is selected to be emptied or connected to the gas storage tank 20. At the same time, as the concentration of the gas entering the buffer tank 12 gradually increases, when oxygen with a qualified concentration continuously enters, the oxygen in the tank that was originally close to qualified will be neutralized into qualified oxygen, further saving gas consumption and improving the oxygen recovery rate.

[0046] When the oxygen concentration in the buffer tank 12 is detected to be unqualified, the drain valve 17 opens and the unqualified oxygen in the buffer tank 12 is discharged. The throttle ring C18 is a reducing throttle valve with an internal aperture of 3mm, which is used to control the flow rate when the buffer tank 12 is emptied.

[0047] In the above structure, the molecular sieve adsorption effect is ensured by the throttling ring B11, and the oxygen production concentration is maintained stable. The opening and closing of the oxygen buffer valve 10 ensures that the pressure in the adsorption tower does not exceed the set upper limit, protects the molecular sieve from being pulverized by overpressure, and extends its service life. The buffer tank 12 will temporarily store a portion of unqualified oxygen. When qualified oxygen enters continuously in the future, it will neutralize the unqualified oxygen, so that all the gases in the buffer tank 12 are qualified, further reducing oxygen consumption and improving oxygen recovery rate. Unqualified oxygen is dynamically isolated by the drain valve 17: when the oxygen concentration test does not meet the standard, the drain valve 17 is immediately opened to completely discharge the low-purity oxygen through the drain pipe, completely blocking unqualified oxygen from entering the gas storage tank 20, and ensuring that the terminal oxygen supply purity always meets medical standards. At the same time, through the combination of the throttling ring C18 and the nitrogen exhaust silencer 19, the exhaust flow rate is reduced while absorbing noise, meeting the quiet requirements of the hospital environment. The main oxygen outlet valve 16, the final control node for terminal oxygen supply, achieves precise "fully open / fully closed" isolation based on oxygen concentration signals. Its normally closed design and reinforced seal structure significantly improve system reliability and cost-effectiveness while ensuring medical oxygen purity standards. This design breaks away from the traditional complex solutions that rely on dynamic pressure regulation, instead achieving safe and stable terminal oxygen supply through hardware-level redundancy and simplified control logic.

Claims

1. A pipeline structure for a medical molecular sieve oxygen concentrator, comprising a molecular sieve tower A and a molecular sieve tower B, wherein compressed air is connected to the air inlets of the molecular sieve tower A and the molecular sieve tower B respectively through an air inlet valve A and an air inlet valve B, characterized in that: It also includes a lower pressure equalizing valve, an upper pressure equalizing valve and a throttle ring A; The oxygen outlets of the molecular sieve tower A and the molecular sieve tower B are respectively connected to the oxygen outlet valve A and the oxygen outlet valve B and then converged into the oxygen buffer pipeline; One end of the lower pressure equalizing valve is connected to the pipeline between the air inlet valve A and the molecular sieve tower A, and the other end is connected to the pipeline between the air inlet valve B and the molecular sieve tower B; One end of the upper pressure equalizing valve is connected to the pipeline between the oxygen outlet valve A and the molecular sieve tower A, and the other end is connected to the pipeline between the oxygen outlet valve B and the molecular sieve tower B; The throttle ring A and the upper pressure equalizing valve are arranged in parallel in the pipeline.

2. The medical molecular sieve oxygen concentrator pipeline structure according to claim 1, characterized in that: The throttle ring A is a reduced-diameter throttle valve with an internal aperture of 2 mm.

3. The medical molecular sieve oxygen concentrator pipeline structure according to claim 1, characterized in that: The oxygen buffer pipeline is provided with an oxygen buffer valve, and a PU hose is provided in parallel with the oxygen buffer valve, and a throttling ring B is provided in the hose.

4. The medical molecular sieve oxygen concentrator pipeline structure according to claim 3, characterized in that: The throttle ring B is a reduced-diameter throttle valve with an internal aperture of 2.5 mm.

5. The medical molecular sieve oxygen concentrator pipeline structure according to claim 3, characterized in that: The end of the oxygen buffer pipeline is connected to a buffer tank, and the buffer tank is connected to the total oxygen outlet pipeline; The total oxygen outlet pipeline has two branch pipelines, one is an unqualified oxygen exhaust pipeline, and the other is a qualified oxygen outlet pipeline. The unqualified oxygen exhaust pipeline is sequentially provided with an exhaust valve, a throttling ring C and a nitrogen exhaust silencer. The qualified oxygen outlet pipeline is installed with a total oxygen outlet valve and then connected to the gas storage tank.

6. The medical molecular sieve oxygen concentrator pipeline structure according to claim 5, characterized in that: The total oxygen outlet pipeline is provided with a pressure detector, an oxygen concentration detector and an oxygen flow meter at the front end of its branches.

7. The medical molecular sieve oxygen concentrator pipeline structure according to claim 5, characterized in that: The throttle ring C is a reduced-diameter throttle valve with an internal aperture of 3 mm.

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